I researched quite a bit for multi-vendor options and decided on Webkul Marketplace. I am very happy with their products and have added a bunch more of their add-on extension.

This extension is the best if you want to build a marketplace! The app is well designed and the support team is really ready to support you in every needed! A must have extension!

In a very short time we have been able to set up a very professional-looking marketplace, that's very easy to use, and we've had top-level support from the Webkul team.